_Brouwer.png) Shape model ofBrouwer from itslightcurve | |
| Discovery[1] | |
|---|---|
| Discovered by | Indiana University (Indiana Asteroid Program) |
| Discovery site | Goethe Link Obs. |
| Discovery date | 14 September 1963 |
| Designations | |
| (1746) Brouwer | |
Named after | Dirk Brouwer (astronomer)[2] |
| 1963 RF · 1940 WE 1947 QA | |
| main-belt · Hilda[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 76.33 yr (27,878 days) |
| Aphelion | 4.7671AU |
| Perihelion | 3.1284 AU |
| 3.9478 AU | |
| Eccentricity | 0.2076 |
| 7.84yr (2,865 days) | |
| 292.05° | |
| 0° 7m 32.52s / day | |
| Inclination | 8.3676° |
| 321.96° | |
| 47.580° | |
| Jupiter MOID | 0.8580 AU |
| TJupiter | 3.0040 |
| Physical characteristics | |
| Dimensions | 61.50±1.80 km[4] 62.523±0.492[5] 64.25±4.9 km(IRAS:2)[3][6] |
| 19.7255±0.0005h[7] 19.8 h[8] 19.88±0.05 h[a] | |
| 0.0448±0.008(IRAS:2)[3][6] 0.048±0.006[5] 0.051±0.003[4] | |
| Tholen =D[1] · D[3][5] B–V = 0.721[1] U–B = 0.227[1] | |
| 9.78±0.30[9] · 9.95(IRAS:2)[6] · 9.95[3][4] | |
1746 Brouwer (prov. designation:1963 RF) is aHilda asteroid from the outermost region of theasteroid belt, approximately 64 kilometers in diameter. It was discovered on 14 September 1963, byIU'sIndiana Asteroid Program atGoethe Link Observatory near Brooklyn, Indiana, United States.[10] It was named after astronomerDirk Brouwer.[2]
Brouwer is a member of theHilda family (001), an asteroid family within the dynamicalHilda group, a large group that orbits inresonance with the gas giant Jupiter and are thought to originate from theKuiper belt.Brouwer orbits the Sun at a distance of 3.1–4.8 AU once every 7 years and 10 months (2,865 days). Its orbit has aneccentricity of 0.21 and aninclination of 8° with respect to theecliptic.[1]
It was first identified as1940 WE atTurku Observatory in 1940, extending the body'sobservation arc by 23 years prior to its official discovery observation.[10]
In theTholen classification,Brouwer is characterized as a dark and reddishD-type asteroid.[1]
Several rotationallightcurves ofBrouwer gave arotation period between 19.72 and 19.88 hours with a brightness variation of 0.21 and 0.35magnitude (U=n.a/2/n.a.).[7][8][a]
According to the surveys carried out by the Infrared Astronomical SatelliteIRAS, the JapaneseAkari satellite, and NASA'sWide-field Infrared Survey Explorer with its subsequentNEOWISE mission,Brouwer measures between 61.50 and 64.25 kilometers in diameter, and its surface has analbedo between 0.045 and 0.051.[4][5][6]
TheCollaborative Asteroid Lightcurve Link agrees with IRAS, that is an albedo of 0.045 and a diameter of 64.25 kilometers with anabsolute magnitude of 9.95.[3]
Thisminor planet was named in honor of Dutch–American astronomerDirk Brouwer (1902–1966). Originally atLeiden University and specialized incelestial mechanics, he became director of theYale University Observatory and was the president ofIAU's commission 20,Positions & Motions of Minor Planets, Comets & Satellites, from 1948 to 1955.[2] The officialnaming citation was published by theMinor Planet Center on 15 July 1968 (M.P.C. 2883).[11]
